{"id":4769,"date":"2026-03-04T09:39:03","date_gmt":"2026-03-04T09:39:03","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4769"},"modified":"2026-03-04T09:39:07","modified_gmt":"2026-03-04T09:39:07","slug":"rohs-compliance-for-pcbs-materials-processes","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/es\/rohs-compliance-for-pcbs-materials-processes\/","title":{"rendered":"Cumplimiento de la directiva RoHS para PCB: Materiales y procesos"},"content":{"rendered":"<p>Desde que la Uni\u00f3n Europea legisl\u00f3 formalmente \u201csin plomo\u201d en diciembre de 2003, la industria electr\u00f3nica mundial sinti\u00f3 un fuerte impacto. En julio de 2006 entraron en vigor las directivas de la UE sobre Residuos de Aparatos El\u00e9ctricos y Electr\u00f3nicos (RAEE) y sobre Restricci\u00f3n de Sustancias Peligrosas (RUSP). Al mismo tiempo, tambi\u00e9n entraron en vigor las normas sobre ausencia de plomo y hal\u00f3genos de la Asociaci\u00f3n de Industrias Electr\u00f3nicas y de Tecnolog\u00edas de la Informaci\u00f3n de Jap\u00f3n (JEITA) y la Asociaci\u00f3n Nacional de Fabricantes El\u00e9ctricos de Estados Unidos (NEMA) para la industria de envases electr\u00f3nicos. A partir de entonces, los productos electr\u00f3nicos comercializados no deben contener plomo, mercurio, cadmio, cromo hexavalente ni cantidades restringidas de polibromobifenilos (PBB) o polibromodifenil\u00e9teres (PBDE) y otras sustancias nocivas. Este cambio afecta a la cadena de suministro mundial y al desarrollo de las industrias relacionadas, incluido el sector de los PCB. Este art\u00edculo explica, a trav\u00e9s del control de las materias primas, la selecci\u00f3n y el control de los procesos sin plomo y el montaje final SMT, c\u00f3mo los productos de PCB de nueva generaci\u00f3n pueden cumplir unas normas medioambientales cada vez m\u00e1s estrictas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Selecci\u00f3n y control de las materias primas<\/h2>\n\n\n\n<p>Es bien sabido que el mercurio, el cadmio y el cromo hexavalente casi nunca se utilizan en la industria de los PCB. Aparte de trazas en el proceso h\u00famedo, los fabricantes de PCB no utilizan deliberadamente estos elementos. Por tanto, a la hora de elegir las materias primas y los procesos, mantener los niveles de plomo (Pb) y hal\u00f3genos por debajo de los l\u00edmites es el principal requisito para cumplir las normas medioambientales b\u00e1sicas. Para los acabados met\u00e1licos de la superficie de los PCB, el objetivo es que no contengan plomo (menos de 0,1% de Pb). PCB tradicionales y <a href=\"https:\/\/flj-pcb.com\/es\/pcb-assembly\/smt-assembly\/\" data-type=\"page\" data-id=\"1923\">SMT <\/a>Las industrias utilizan muchas aleaciones de plomo y esta\u00f1o, como HASL y la pasta de soldadura. El plomo es un elemento met\u00e1lico pesado y existe ampliamente en la naturaleza. Cuando la ingesta humana de plomo supera los niveles seguros, pueden aparecer s\u00edntomas como anemia, deficiencia de calcio y reducci\u00f3n de la inmunidad.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.1 \u00bfPor qu\u00e9 utilizar soldaduras sin plomo?<\/h3>\n\n\n\n<p>Da\u00f1os por plomo en soldaduras: Aunque el plomo contenido en las soldaduras representa una peque\u00f1a parte del uso total de plomo en algunas escalas, puede extenderse y es dif\u00edcil de recuperar totalmente. La contaminaci\u00f3n ambiental y la preocupaci\u00f3n por el envenenamiento por plomo empujan a prescindir de este metal. En los PCB, los hal\u00f3genos (fl\u00faor F, cloro Cl, bromo Br, yodo I) se utilizan principalmente en laminados y tintas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.2 Selecci\u00f3n de material<\/h3>\n\n\n\n<p>Una placa de circuito impreso acabada contiene principalmente tres grupos de cosas: el laminado (material base), las capas de acabado de la superficie met\u00e1lica y las tintas.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.1 Material de base<\/h4>\n\n\n\n<p>Laminados comunes como <a href=\"https:\/\/flj-pcb.com\/es\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR-4<\/a> y CEM-3 suelen contener muchas resinas epoxi bromadas. Estas resinas pueden incluir tetrabromobisfenol A, bifenilos polibromados y \u00e9teres difen\u00edlicos polibromados. Cuando estos materiales arden, pueden liberar compuestos altamente t\u00f3xicos como dioxinas (TCDD) y furanos. Si los seres humanos ingieren estos compuestos, son dif\u00edciles de eliminar del organismo y plantean graves riesgos para la salud. Por ello, la industria de laminados revestidos de cobre debe pasar a utilizar materiales de base sin hal\u00f3genos. Sin hal\u00f3genos significa que tanto el cloro como el bromo est\u00e1n por debajo de 0,09%. Utilice resinas epoxi que contengan f\u00f3sforo para sustituir a las resinas epoxi bromadas. Utilice resinas fen\u00f3licas que contengan nitr\u00f3geno para sustituir a los agentes de curado tradicionales de diciandiamida.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate.webp\" alt=\"Halogen-free substrate\" class=\"wp-image-4771\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-768x576.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-16x12.webp 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Adem\u00e1s, los laminados ecol\u00f3gicos deben tener una gran resistencia al calor. Deben soportar varios ciclos de reflujo SMT sin plomo a 260 \u00b0C sin decolorarse, deslaminarse, deformarse ni alabearse.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.2 Capas met\u00e1licas superficiales<\/h4>\n\n\n\n<p>En la actualidad, la industria utiliza ampliamente HASL sin plomo con una f\u00f3rmula de esta\u00f1o-plata-cobre (por ejemplo, 95,5Sn-3,9Ag-0,6Cu) en lugar de aleaciones de plomo-esta\u00f1o. Los revestimientos superficiales de PCB sin plomo deben mostrar una buena humectaci\u00f3n y fluidez. Deben producir baja tensi\u00f3n t\u00e9rmica y resistir la oxidaci\u00f3n a alta temperatura. Esto ayuda al procesamiento SMT sin plomo. El fundente utilizado para HASL tambi\u00e9n debe ser ecol\u00f3gico, reciclable y compatible con los fundentes SMT para que refluyan juntos.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.3 Tintas<\/h4>\n\n\n\n<p>Las tintas que quedan en la placa de circuito impreso incluyen tintas para m\u00e1scaras de soldadura, tintas para leyendas y tintas para relleno de v\u00edas. Las f\u00f3rmulas de las tintas son similares a las de los laminados. Contienen principalmente resina, retardantes de llama bromados y agentes de curado. Muchas marcas de tinta modernas ya producen tintas sin sustancias nocivas. La elecci\u00f3n de la tinta debe cumplir las normas medioambientales y tambi\u00e9n sobrevivir a ciclos repetidos de SMT sin plomo a alta temperatura. Las tintas no deben deslaminarse, decolorarse, descascarillarse ni agrietarse tras el procesamiento.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.4 Control de los materiales sin plomo<\/h4>\n\n\n\n<p>La gesti\u00f3n de las materias primas es un eslab\u00f3n muy importante para una producci\u00f3n de PCB respetuosa con el medio ambiente. Por ejemplo, si se a\u00f1ade por error una barra de soldadura con plomo a un bote de esta\u00f1o puro, el resultado puede ser catastr\u00f3fico. Tampoco hay que ignorar los residuos de materiales indirectos, como el fundente. Entre las medidas pr\u00e1cticas figuran:<\/p>\n\n\n\n<p>Establezca c\u00f3digos de material para materias primas sin hal\u00f3genos ni plomo.<\/p>\n\n\n\n<p>Utilice marcas de color e imprima una etiqueta \u201cverde\u201d homologada en el embalaje exterior e interior.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label.webp\" alt=\"Green label\" class=\"wp-image-4770\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-300x300.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-150x150.webp 150w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-12x12.webp 12w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<p>Almacene los materiales ecol\u00f3gicos por separado en el almac\u00e9n y en la planta de producci\u00f3n. Asigne personal espec\u00edfico para a\u00f1adirlos en la producci\u00f3n.<\/p>\n\n\n\n<p>Implantar un programa de certificaci\u00f3n de \u201cproveedores cualificados ecol\u00f3gicos\u201d.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Selecci\u00f3n y control de procesos sin plomo<\/h2>\n\n\n\n<p>Los procesos de superficie sin plomo para PCB incluyen Ni\/Au galv\u00e1nico, Ni\/ Au de inmersi\u00f3n qu\u00edmico, OSP (conservante org\u00e1nico de soldabilidad), esta\u00f1o de inmersi\u00f3n (esta\u00f1o qu\u00edmico) y plata de inmersi\u00f3n (plata qu\u00edmica).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 Pasos para introducir procesos sin plomo<\/h3>\n\n\n\n<p>Siga estos pasos: dise\u00f1o de ingenier\u00eda \u2192 desarrollo t\u00e9cnico \u2192 evaluaci\u00f3n de la fiabilidad \u2192 adquisici\u00f3n de materiales \u2192 ejecuci\u00f3n del proyecto y despliegue t\u00e9cnico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 Aplicaci\u00f3n y control del proceso<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.1 Dise\u00f1o de ingenier\u00eda CAM<\/h4>\n\n\n\n<p>El dise\u00f1o a nivel de proyecto de placas de circuito impreso ecol\u00f3gicas debe tener en cuenta los efectos sobre el postprocesado SMT y el funcionamiento de la placa de circuito impreso tras el montaje. El trabajo CAM debe tener en cuenta los pasos SMT.<\/p>\n\n\n\n<p>Ejemplo de dise\u00f1o de la disposici\u00f3n (enrutamiento y formas de los pads):<\/p>\n\n\n\n<p>Evite el movimiento de los componentes durante la soldadura por ola o selectiva. Reduzca el di\u00e1metro de algunos pads para reducir el riesgo de puentes.<\/p>\n\n\n\n<p>Evite la formaci\u00f3n de puentes entre los conductores del QFP durante la soldadura por ola. Si es necesario, incline las piezas QFP y dise\u00f1e zonas de soldadura falsas.<\/p>\n\n\n\n<p>Para las virutas blandas, mantenga las reglas anteriores. Coloque las aberturas de la pel\u00edcula protectora cerca de los bordes interiores.<\/p>\n\n\n\n<p>Evitar el alabeo del tablero:<\/p>\n\n\n\n<p>Compruebe la resistencia al calor de la placa. Preste atenci\u00f3n a las temperaturas m\u00e1ximas de fusi\u00f3n blanda bajo la humedad.<\/p>\n\n\n\n<p>Para tableros grandes o que lleven piezas pesadas, prepare zonas de apoyo en el centro para reducir el alabeo.<\/p>\n\n\n\n<p>Al colocar las piezas, procure que la distribuci\u00f3n de la masa t\u00e9rmica sea uniforme.<\/p>\n\n\n\n<p>Las planchas multicapa finas o las planchas con ranuras cortadas se deforman f\u00e1cilmente con el calor de fusi\u00f3n blanda. Considere cuidadosamente la forma y el tama\u00f1o.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.2 Desarrollo t\u00e9cnico<\/h4>\n\n\n\n<p>El desarrollo y control de procesos es un \u00e1rea clave para la producci\u00f3n ecol\u00f3gica de PCB. Las acciones pr\u00e1cticas incluyen:<\/p>\n\n\n\n<p>No utilice materiales ecol\u00f3gicos y no ecol\u00f3gicos en la misma l\u00ednea. Separe procesos como el revelado y la limpieza final.<\/p>\n\n\n\n<p>Marcar los productos ecol\u00f3gicos en las hojas de MI (instrucciones de fabricaci\u00f3n). Exigir una firma que confirme el proceso sin plomo para recordar a los operarios.<\/p>\n\n\n\n<p>Haga que las herramientas y accesorios de producci\u00f3n de productos ecol\u00f3gicos sean obvios con etiquetas visibles.<\/p>\n\n\n\n<p>Las tintas deben resistir repetidas SMT sin plomo a altas temperaturas. El tratamiento previo y el secado del sustrato son muy importantes. Despu\u00e9s de HASL o SMT sin plomo, la tinta puede pelarse en los bordes de los orificios. Esto suele deberse a la humedad que queda en los orificios y en las superficies. A altas temperaturas, la humedad se expande y separa la tinta del cobre.<\/p>\n\n\n\n<p>No a\u00f1ada disolventes a la tinta de la m\u00e1scara de soldadura. De este modo se evita la evaporaci\u00f3n r\u00e1pida del disolvente en los orificios sometidos a un calor elevado, lo que puede causar da\u00f1os en los orificios.<\/p>\n\n\n\n<p>Mantener el contenido de cobre en los crisoles de soldadura HASL por debajo de 0,85%.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.3 Evaluaci\u00f3n de la fiabilidad<\/h4>\n\n\n\n<p>En comparaci\u00f3n con las placas de circuito impreso no ecol\u00f3gicas, las ecol\u00f3gicas necesitan pruebas de fiabilidad m\u00e1s estrictas. A\u00f1ada estas pruebas:<\/p>\n\n\n\n<p>Prueba de soldabilidad. Utilice el mismo tipo de soldadura sin plomo que se utilizar\u00e1 en producci\u00f3n.<\/p>\n\n\n\n<p>Ensayo de choque t\u00e9rmico. Condiciones: -40 \u00b0C \/ 85 \u00b0C \/ 125 \u00b0C. Despu\u00e9s de 3000 ciclos no debe haber grietas.<\/p>\n\n\n\n<p>Prueba de ciclos t\u00e9rmicos. Sin grietas ni huecos por contracci\u00f3n.<\/p>\n\n\n\n<p>Prueba de calor h\u00famedo. Condiciones: 60 \u00b0C y 90-95% HR durante 500 horas. En condiciones de temperatura y humedad elevadas y prolongadas, no deben aparecer productos similares a bigotes met\u00e1licos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. PCB ecol\u00f3gico en el montaje final SMT<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 Caracter\u00edsticas SMT sin plomo<\/h3>\n\n\n\n<p>La soldadura sin plomo tiene un punto de fusi\u00f3n m\u00e1s alto. Presenta menor humectaci\u00f3n y fluidez, mayor tensi\u00f3n t\u00e9rmica, peor humectabilidad y es m\u00e1s propensa a la oxidaci\u00f3n. Esto exige unas condiciones de fabricaci\u00f3n y un control de calidad m\u00e1s estrictos.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.1 Dise\u00f1o de la l\u00ednea SMT<\/h4>\n\n\n\n<p>Aumentar la temperatura de precalentamiento. Controlar la velocidad de la l\u00ednea SMT a aproximadamente 1,2-1,8 m\/min. Ajuste la inclinaci\u00f3n del transportador a 3-5 grados. Proporcione compensaci\u00f3n t\u00e9rmica donde sea necesario para que el \u00e1rea SMT se mantenga a una temperatura estable.<\/p>\n\n\n\n<p>Para garantizar una buena humectaci\u00f3n, mantenga el rango de temperatura de precalentamiento adecuado.<\/p>\n\n\n\n<p>Soldador y control t\u00e9rmico:<\/p>\n\n\n\n<p>La temperatura de la superficie de la pieza en la placa debe permanecer por debajo de su l\u00edmite t\u00e9rmico garantizado, mientras que la parte posterior de la placa puede alcanzar unos 250 \u00b0C. Acorte la distancia entre las etapas de calentamiento para mantener la ca\u00edda de temperatura entre las olas dentro de unos 55 \u00b0C.<\/p>\n\n\n\n<p>Cuando se utiliza soldadura Sn-Ag-Cu, es posible dejar de utilizar la primera ola.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.2 Soldadura de repaso manual<\/h4>\n\n\n\n<p>Ajuste la temperatura del soldador a unos 370 \u00b1 10 \u00b0C. Utilice una punta cromada. Utilice un soldador de 80 W para tiempos de contacto cortos, como 3 segundos. Precaliente el sustrato a 50-60 \u00b0C. Si el soldador no se ha utilizado durante mucho tiempo, limpie los contaminantes de la punta. Humedezca la punta con soldadura nueva y, a continuaci\u00f3n, desconecte la alimentaci\u00f3n para evitar la oxidaci\u00f3n.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.3 Utilizaci\u00f3n de la protecci\u00f3n contra el nitr\u00f3geno y sus ventajas<\/h4>\n\n\n\n<p>Mejorar la atm\u00f3sfera del proceso.<\/p>\n\n\n\n<p>Reduce la oxidaci\u00f3n y mejora la humectaci\u00f3n de la soldadura en los cables de los componentes.<\/p>\n\n\n\n<p>Mejorar el aspecto, ya que las juntas sin plomo brillan menos.<\/p>\n\n\n\n<p>Reduce el cambio de color causado por la exposici\u00f3n prolongada a altas temperaturas en procesos sin plomo.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 Notas sobre investigaci\u00f3n y procesos especiales<\/h3>\n\n\n\n<p>3.2.1 Estudiar soldaduras de bajo punto de fusi\u00f3n por debajo de 125 \u00b0C como opci\u00f3n para casos especiales.<\/p>\n\n\n\n<p>3.2.2 Utilice m\u00e9todos de calentamiento local (calentamiento por puntos, infrarrojos o RF) para soldar determinadas piezas a 240-260 \u00b0C. Las piezas deben tolerar el calor durante m\u00e1s de 40 segundos. Las herramientas de calentamiento local pueden incluir l\u00e1ser, flash de xen\u00f3n (sin contacto), deslizadores calientes o calentadores de impulsos (contacto).<\/p>\n\n\n\n<p>3.2.3 Seguir normas como <a href=\"https:\/\/ja.wikipedia.org\/wiki\/ISO_14000\" target=\"_blank\" rel=\"noopener\">ISO 14000<\/a> y las especificaciones de proceso del cliente. Las pr\u00e1cticas ecol\u00f3gicas incluyen materiales sin plomo ni hal\u00f3genos, purificaci\u00f3n del aire y sistemas de recuperaci\u00f3n de fundente que pueden filtrar y reciclar unas 90% de fundente.<\/p>\n\n\n\n<p>3.2.4 Utilizar medidas antimoho y antitermitas cuando sea necesario para los PCB.<\/p>\n\n\n\n<p>3.2.5 Investigar y aplicar sustratos de PCB org\u00e1nicos reciclables y biodegradables.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Lista de comprobaci\u00f3n resumida para ingenieros y equipos de producci\u00f3n<\/h2>\n\n\n\n<p>Verificar todos los certificados de an\u00e1lisis (COA) de las materias primas. Confirmar que los niveles de hal\u00f3genos y plomo est\u00e1n por debajo de los l\u00edmites. Mantener los archivos de COA para las auditor\u00edas.<\/p>\n\n\n\n<p>Utilice un almacenamiento separado y un etiquetado claro para los materiales sin plomo y sin hal\u00f3genos. Forme al personal para evitar la contaminaci\u00f3n cruzada.<\/p>\n\n\n\n<p>Actualizaci\u00f3n de las normas CAD y CAM para el procesamiento sin plomo. Ajuste los tama\u00f1os de los pads y las aperturas de las m\u00e1scaras de soldadura seg\u00fan sea necesario.<\/p>\n\n\n\n<p>Realice pruebas y eval\u00fae la soldabilidad, el choque t\u00e9rmico, los ciclos t\u00e9rmicos y las pruebas de calor h\u00famedo. Realice un seguimiento de los resultados y comp\u00e1relos con los valores de referencia.<\/p>\n\n\n\n<p>Controlar la composici\u00f3n del ba\u00f1o HASL y supervisar el contenido de cobre. Mantener bien controlados los procesos de chapado y limpieza.<\/p>\n\n\n\n<p>Aseg\u00farese de que las zonas de precalentamiento de las l\u00edneas SMT son estables. Utilice nitr\u00f3geno siempre que sea posible para reducir la oxidaci\u00f3n.<\/p>\n\n\n\n<p>Mejorar los pasos de secado y horneado para eliminar la humedad antes de los procesos de alta temperatura. Utilice hornos controlados para el secado de sustratos.<\/p>\n\n\n\n<p>Aplique el revestimiento de conformaci\u00f3n cuando el uso del producto o el entorno requieran una protecci\u00f3n adicional contra la humedad.<\/p>\n\n\n\n<p>Realice auditor\u00edas a los proveedores y apruebe s\u00f3lo a los que cumplan los requisitos ecol\u00f3gicos. Exigir a los proveedores declaraciones sobre RoHS y ausencia de hal\u00f3genos.<\/p>\n\n\n\n<p>Planificar el reciclaje al final de la vida \u00fatil. Dise\u00f1ar para el desmontaje y la recuperaci\u00f3n de materiales cuando sea posible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Notas finales<\/h2>\n\n\n\n<p>Cumplir las normas RoHS no es s\u00f3lo un cambio material. Es un cambio en toda la cadena de suministro. Afecta a la selecci\u00f3n de materiales, el control de procesos en f\u00e1brica, el dise\u00f1o de productos y el montaje final. Tambi\u00e9n modifica las pruebas y el trabajo de fiabilidad a largo plazo. Los equipos deben planificar con cuidado y actuar por pasos. Empezar con un control estricto de los materiales y el dise\u00f1o CAM. Desarrollar procesos estables sin plomo. Realice pruebas de fiabilidad exhaustivas. Formar a los operarios y mantener registros claros. 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